The dissolution of the abuser's marriage or other meaningful (romantic, business, or other) relationships constitutes a major life crisis and a scathing narcissistic injury. To soothe and salve the pain of disillusionment, he administers to his aching soul a mixture of lies, distortions, half-truths and outlandish interpretations of events around him.
All abusers present with rigid and infantile (primitive) defense mechanisms: splitting, projection, Projective Identification, denial, intellectualization, and narcissism. But some abusers go further and decompensate by resorting to self-delusion. Unable to face the dismal failures that they are, they partially withdraws from reality.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)